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A spokesman for the company said: "All Marketplace sellers must follow our selling guidelines and those who don't will be subject to action including potential removal of their account. The products in question are no longer available."

Slime from high street retailers, The Works and Smyths, which was tested also met the standard.

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"Manufacturers must stop making unsafe products and the Government and retailers simply have to do a far better job of getting anything identified as a risk off the shelves and out of people's homes".

A Department for Business, Energy and Industrial Strategy spokesman said: "The Government's top priority is to keep people safe, which is why goods being sold in the UK must meet some of the strictest safety laws in the world.

"The evidence provided by Which? will be considered by the Office for Product Safety and Standards and [it can] take any appropriate action."